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Rasdianah Dahali
Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia

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Journal article
Published: 19 May 2021 in Forests
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Eucalyptus hybrid has been planted rigorously in wet tropical regions including Malaysia. Recently, there was a report on the occurrence of stem canker on these trees. However, the extent of the infections by this stem canker is unknown. The aim of this study was to evaluate the influence of stem canker disease, Chrysoporthe deuterocubensis, on the physical and mechanical properties of 11-year-old E. urophylla × E.grandis or also known as E. urograndis. The samples were taken from infected and healthy trees that were segregated into different classes based on the severity of the attack, i.e., healthy (class 1), moderately infected (class 2), severely infected (class 3) and very severely infected (class 4). A total of 1440 samples from four infection classes were used in this study. The physical and mechanical properties were determined according to the standard test procedures specified by the International Organization for Standardization (ISO) 13061:2014 (Parts 1 to 4, 13, 14 and 17) and British Standard (BS 373: 1957). From the result, a significant effect by the infection classes was observed on physical and mechanical properties of E. urograndis. All infected wood experienced less shrinkage compared to that of a healthy one, particularly the volumetric (Volsh) and radial shrinkage (Rsh). Wood from class 2 and class 3 was less affected by the infection while the majority of wood from class 4 had significantly lower density and poorer strength. Based on the strength data, wood from infection class 2 can be considered to be used for non-structural applications such as furniture, interior finishing, window frames and doors since reduction in mechanical properties was observed. Wood from class 3 would need further investigation to examine its suitability for structural applications.

ACS Style

Rasdianah Dahali; Paridah Md. Tahir; Adlin Roseley; Lee Hua; Edi Bakar; Zaidon Ashaari; Mohd Abdul Rauf; Nur Zainuddin; Noor Mansoor. Influence of Chrysoporthe deuterocubensis Canker Disease on the Physical and Mechanical Properties of Eucalyptus urograndis. Forests 2021, 12, 639 .

AMA Style

Rasdianah Dahali, Paridah Md. Tahir, Adlin Roseley, Lee Hua, Edi Bakar, Zaidon Ashaari, Mohd Abdul Rauf, Nur Zainuddin, Noor Mansoor. Influence of Chrysoporthe deuterocubensis Canker Disease on the Physical and Mechanical Properties of Eucalyptus urograndis. Forests. 2021; 12 (5):639.

Chicago/Turabian Style

Rasdianah Dahali; Paridah Md. Tahir; Adlin Roseley; Lee Hua; Edi Bakar; Zaidon Ashaari; Mohd Abdul Rauf; Nur Zainuddin; Noor Mansoor. 2021. "Influence of Chrysoporthe deuterocubensis Canker Disease on the Physical and Mechanical Properties of Eucalyptus urograndis." Forests 12, no. 5: 639.

Journal article
Published: 29 May 2020 in Sustainability
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In this study, the effect of superheated steam (SHS) treatment on the changes of the chemical composition and biological properties of two tropical hardwoods was investigated. SHS was carried out on light red meranti (Shorea spp.) and kedondong (Canarium spp.) wood with dimensions of 410 × 25 × 25 mm, using superheated steam as the heating medium. Wood samples were heat-treated at nine treatment levels, ranging from 172 to 228 °C and 95 to 265 min, respectively. The chemical constituents and resistance against white rot fungus (Pycnoporus sanguineus) and subterranean termite (Coptotermus curvignathus) of the treated wood were evaluated. A significant reduction in holocellulose content and increment in lignin was observed after SHS treatment. Consequently, the resistance against white rot fungus and termites improved. The biological durability improved with an increasing treatment temperature and time. A regression analysis revealed that the reduced equilibrium moisture content imparted superior biological resistance to the treated wood. Weight loss caused by the thermal degradation also served as a good indicator for fungal decay, as the loss of weight was directly proportional to the improvement in fungal resistance. However, this did not apply to termite resistance, as a very weak relationship was found between the two variables.

ACS Style

Rasdianah Dahali; Seng Hua Lee; Zaidon Ashaari; Edi Suhaimi Bakar; Hidayah Ariffin; Pui San Khoo; Paiman Bawon; Qamariah Norhidayah Salleh. Durability of Superheated Steam-Treated Light Red Meranti (Shorea spp.) and Kedondong (Canarium spp.) Wood against White Rot Fungus and Subterranean Termite. Sustainability 2020, 12, 4431 .

AMA Style

Rasdianah Dahali, Seng Hua Lee, Zaidon Ashaari, Edi Suhaimi Bakar, Hidayah Ariffin, Pui San Khoo, Paiman Bawon, Qamariah Norhidayah Salleh. Durability of Superheated Steam-Treated Light Red Meranti (Shorea spp.) and Kedondong (Canarium spp.) Wood against White Rot Fungus and Subterranean Termite. Sustainability. 2020; 12 (11):4431.

Chicago/Turabian Style

Rasdianah Dahali; Seng Hua Lee; Zaidon Ashaari; Edi Suhaimi Bakar; Hidayah Ariffin; Pui San Khoo; Paiman Bawon; Qamariah Norhidayah Salleh. 2020. "Durability of Superheated Steam-Treated Light Red Meranti (Shorea spp.) and Kedondong (Canarium spp.) Wood against White Rot Fungus and Subterranean Termite." Sustainability 12, no. 11: 4431.